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For bugs in Firefox Desktop, the Mozilla Foundation's web browser. For Firefox user interface issues in menus, bookmarks, location bar, and preferences. Many Firefox bugs will either be filed here or in the Core product. Bugs for developer tools (F12) should be filed in the DevTools product. (more info)

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User Story

User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b4) Gecko/2008030714 Firefox/3.0b4
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b4) Gecko/2008030714 Firefox/3.0b4
The main window of Firefox is not maximized if fullscreen toggling was done and Firefox was reopened.
Reproducible: Always
Steps to Reproduce:
1. Start Firefox and have ONE Firefox's window opened and MAXIMIZED.
2. Now press the F11 button on your keyboard to view the page fullscreen.
3. Press the F11 button again to exit the fullscreen view.
4. Now exit Firefox.
5. Open Firefox again and see that you don't have the window maximized
anymore, but you should've had.
This is a regression bug of Firefox for Windows OS.
Note: I've tested this bug in Firefox 3.0 Beta 4 for Linux in Ubuntu 8.04 Beta and the bug was not reproducible there.
This bug should be fixed!

For me the issue is not related to restarting Firefox, but it just does not restore the "maximized" properties (_NET_WM_STATE(ATOM) = _NET_WM_STATE_MAXIMIZED_VERT, _NET_WM_STATE_MAXIMIZED_HORZ) when leaving fullscreen mode (and unsets them before going to fullscreen).
See https://github.com/awesomeWM/awesome/issues/245 with more details.